Influence of grain direction in vibrational wood welding

Properzi, Milena; Leban, Jean-Michel; Pizzi, Antonio; Wieland, Stephanie; Pichelin, Frédéric; Lehmann, Mario (2005). Influence of grain direction in vibrational wood welding Holzforschung, 59(1), pp. 23-27. De Gruyter 10.1515/HF.2005.004

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Wood grain orientation differences in the two surfaces to be bonded yield bondlines of different strength in no-adhesives wood welding. Longitudinal wood grain bonding of tangential and radial wood sections yields an approximately 10% difference in strength results of the joint. Cross-grain (±90°) bonding yields instead a much lower strength result, roughly half that observed for pieces bonded with the grain parallel to each other. These differences can be explained by the very marked effect that homogeneity of fibre orientation is known to have on fibre–matrix composites. Oak yields lower results than beech and maple and is more sensitive to welding conditions. Differences in both anatomical and wood constituent composition can account for this difference in performance. Contrary to the other wood species, oak always presents joint bondlines where little or no increase in density at the interface is noticed. This explains its somewhat lower strength results. This is based on the different mode of bonding predominant in this species, while the other species present two different modes of bonding. Thus, two types of bondlines are observed by scanning electron microscopy (SEM): (i) bondlines where entangled fibre–matrix composites are formed at the interface and (ii) bondlines in which direct welding of the cell walls occurs, just by fused intercellular material or cell surface material. In this latter case the cells remain flat, without an entangled fibre–matrix composite being formed. This is the almost exclusively predominant case for oak. Both cases and even hybrid cases between the two have also been observed in beech.

Item Type:

Journal Article (Original Article)

Division/Institute:

BFH Zentren > BFH Zentrum Holz - Ressource und Werkstoff
Department of Architecture, Wood and Civil Engineering
Department of Architecture, Wood and Civil Engineering > Bereich Forschung & Entwicklung, Dienstleistungen und Weiterbildung
Department of Architecture, Wood and Civil Engineering > Bereich Forschung & Entwicklung, Dienstleistungen und Weiterbildung > Institut für Werkstoffe und Holztechnologie

Name:

Properzi, Milena; Leban, Jean-Michel; Pizzi, Antonio; Wieland, Stephanie; Pichelin, Frédéric and Lehmann, Mario

Subjects:

Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
T Technology > TS Manufactures

ISSN:

0018-3830

Publisher:

De Gruyter

Language:

English

Submitter:

Christelle Ganne-Chédeville

Date Deposited:

22 Apr 2020 14:16

Last Modified:

22 Apr 2020 14:16

Publisher DOI:

10.1515/HF.2005.004

Uncontrolled Keywords:

Bonding modes Wood grain Wood melting Wood welding

ARBOR DOI:

10.24451/arbor.11269

URI:

https://arbor.bfh.ch/id/eprint/11269

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